EP2351173B1 - Bougie d'allumage avec bobine intégrée - Google Patents

Bougie d'allumage avec bobine intégrée Download PDF

Info

Publication number
EP2351173B1
EP2351173B1 EP09783863A EP09783863A EP2351173B1 EP 2351173 B1 EP2351173 B1 EP 2351173B1 EP 09783863 A EP09783863 A EP 09783863A EP 09783863 A EP09783863 A EP 09783863A EP 2351173 B1 EP2351173 B1 EP 2351173B1
Authority
EP
European Patent Office
Prior art keywords
coil
shaft
electrode
spark plug
ignition
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP09783863A
Other languages
German (de)
English (en)
Other versions
EP2351173A1 (fr
Inventor
Volker Heise
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Delphi Technologies Inc
Original Assignee
Delphi Technologies Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Delphi Technologies Inc filed Critical Delphi Technologies Inc
Priority to EP09783863A priority Critical patent/EP2351173B1/fr
Publication of EP2351173A1 publication Critical patent/EP2351173A1/fr
Application granted granted Critical
Publication of EP2351173B1 publication Critical patent/EP2351173B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00—Sparking plugs
    • H01T13/40—Sparking plugs structurally combined with other devices
    • H01T13/44—Sparking plugs structurally combined with other devices with transformers, e.g. for high-frequency ignition

Definitions

  • the present invention relates generally to a spark plug for an internal combustion engine.
  • the traditional ignition system consists of a spark plug acting as an electrical feed into a combustion chamber of a gasoline engine, providing concentrated thermal energy release, in the form of a spark, to initiate the combustion.
  • a conventional transformer is used, incorporating electronics to condition and to feed energy from the electrical network in vehicles (Battery, Generator).
  • a resonance based ignition system comprises of a resonator (2), a generator (1) and heat release interface (3).
  • a resonance ignition system requires an electrical feed through into the combustion chamber as conventional systems.
  • the shaft of the sparkplug is designed to withstand the voltages applied to the centre electrode of this removable interface: Sparkplug to Ignition-coil or Spark plug to harness-terminal.
  • the purpose is to not let the spark finding its path to ground outside the combustion chamber.
  • Such interface is adding mechanical length, which is adding electrical capacitance to the output or load of and ignition system.
  • a sparkplug according to the preamble of claim 1 has been proposed in document US2004/0025854A1 .
  • the present invention provides integration of the electrical feed-through with the resonance coil, while combining both into one element.
  • the result is that there is no removable interface between the spark plug and the ignition resonance coil.
  • the benefit is a reduced capacitance of the electrical feed through side, which allows a higher amplification of the resonance structure. Furthermore it reduces the variability of resonance frequency compared to a separate design of two elements, because the resonance frequency is a function of the electrical features of both elements.
  • a spark plug for an internal combustion engine comprising a lower centre electrode and a ground electrode facing the combustion side of the engine, said ground electrode extending from an electrically conductive annular body connected to the ground, and comprising a hollow shaft made of insulating material, said shaft comprising a lower portion extending between the centre electrode and the body, said shaft comprising an upper portion around which an ignition coil is wound, characterized in that the upper end of the centre electrode is accessible through an open side of the shaft and designed/finished in form of a terminal suitable to connect the starting wire of the coil at the lower end of the coil.
  • a conventional spark plug centre electrode 10 is made out of three major elements, which are the lower electrode 12 facing the combustion side, conductive cement 14 forming a current limiting resistor and an upper electrode 16 pointing towards the ignition-coil interface 18.
  • the conductive cement 14 and the upper electrode 16 are built in the shaft 20 of the spark-plug 22 which is made of insulating material such as ceramic material.
  • the centre electrode 10 and the shaft 20 are arranged in a generally cylindrical tubular metal body 24 which acts as the ground for the sparks passing through the center electrode 10 to a ground electrode 26 extending from the lower tip of the body 24.
  • the body 24 comprises a threaded outer portion 28 to be threadedly engaged in the cylinder head of the engine.
  • the ground electrode 26 can be made from high nickel steel and is welded to the side of the body lower end 30. Multiple side electrodes may also be used, so that they do not overlap the centre electrode 10.
  • the spark-plug 22 is designed such that a single layer coil 32 can be wound on the shaft 20 like in figure 3 .
  • the possible implementation would extend the shaft 20.
  • the lower end 34 (engine face) of the spark-plug 22 would remain unchanged compared to conventional spark-plug.
  • the shaft 20 is made out of the existing ceramic material and is cylindrical and hollow in geometry, forming a central bore 38 such that the centre electrode upper end 36 at the lower end of the central bore 38 is accessible through the open side 40 of the shaft end and designed/finished in form of a terminal 42 suitable to connect the starting wire 44 of the coil 32. This means that the conventional cement and upper centre electrode are removed.
  • the single layer coil wire 46 of diameter 0.5mm ⁇ d ⁇ 2mm is contacted through a hole 48 at the low bottom side of the ceramic directly on the lower electrode surface or in case the electrode 10 requires an additional anchor, the anchor provides suitable terminal 42.
  • the open side 40 of the shaft 20 allows inserting suitable means to contact this wire end on the terminal 42 inside the hollow shaft 20 with any suitable brazing and soldering method. Thereafter the wire 46 is wound on the shaft 20.
  • the wire 46 requires defined guidance for winding on either the shaft 20 itself, or through an additional sleeve 50 on the shaft 20. Both options require suitable grooves 52 in form of a screw to guide the wire 46 and to define the distance from turn to turn.
  • Such construction requires further an insulation layer 54 and a nonmagnetic metal layered shield 56 on top of the single layer coil 32.
  • the hollow shaft 20 comprises a lower portion 58 standing between the centre electrode 10 and the annular body 24, and an upper portion 60 forming the core member of the ignition coil 32, said ignition coil 32 being wound around said upper portion 60.
  • the lower portion 58 and the upper portion 60 of the shaft 20 are made of one piece.
  • the centre electrode 10 extends essentially from the lower end 62 to the upper end 64 of the hollow shaft lower portion 58.
  • the centre electrode 10 is inserted coaxially in the through bore portion extending axially in the shaft lower portion 58.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Spark Plugs (AREA)

Claims (4)

  1. Bougie d'allumage (22) pour un moteur à combustion interne, comprenant une électrode centrale inférieure (10) et une électrode de masse (26) face au côté combustion du moteur, ladite électrode de masse (26) s'étendant depuis un corps annulaire électriquement conducteur (20) connecté à la masse, et comprenant une tige creuse (20) réalisée en matériau isolant, ladite tige (20) comprenant une portion inférieure (58) s'étendant entre l'électrode centrale (10) et le corps (20), ladite tige (20) comprenant une portion supérieure (60) autour de laquelle est enroulée une bobine d'allumage (32),
    caractérisée en ce que l'extrémité supérieure (36) de l'électrode centrale (10) est accessible via un côté ouvert (40) de la tige (20) et est conçue/finie sous la forme d'une borne (42) appropriée à connecter le fil de mise en marche (44) de la bobine (32) à l'extrémité inférieure de la bobine (32).
  2. Bougie d'allumage (22) selon la revendication 1, caractérisée en ce que la tige (20) est réalisé en matériau céramique et présente une géométrie cylindrique et creuse.
  3. Bougie d'allumage (22) selon l'une quelconque des revendications précédentes, caractérisée en ce que la bobine (32) est constituée d'une bobine monocouche.
  4. Bougie d'allumage (22) selon l'une quelconque des revendications précédentes, caractérisée en ce qu'elle comprend en outre un écran (56) formé d'une couche de métal non magnétique sur le sommet de la bobine (32).
EP09783863A 2008-10-13 2009-10-08 Bougie d'allumage avec bobine intégrée Not-in-force EP2351173B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09783863A EP2351173B1 (fr) 2008-10-13 2009-10-08 Bougie d'allumage avec bobine intégrée

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP08166510 2008-10-13
EP09783863A EP2351173B1 (fr) 2008-10-13 2009-10-08 Bougie d'allumage avec bobine intégrée
PCT/EP2009/063119 WO2010043544A1 (fr) 2008-10-13 2009-10-08 Bougie d'allumage avec bobine intégrée

Publications (2)

Publication Number Publication Date
EP2351173A1 EP2351173A1 (fr) 2011-08-03
EP2351173B1 true EP2351173B1 (fr) 2012-11-07

Family

ID=40512229

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09783863A Not-in-force EP2351173B1 (fr) 2008-10-13 2009-10-08 Bougie d'allumage avec bobine intégrée

Country Status (2)

Country Link
EP (1) EP2351173B1 (fr)
WO (1) WO2010043544A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2456027A1 (fr) * 2010-11-23 2012-05-23 Delphi Technologies, Inc. Encapsulation d'un résonateur haute fréquence pour le système d'ignition d'un moteur à combustion interne
US8638540B2 (en) * 2010-12-15 2014-01-28 Federal-Mogul Ignition Company Corona igniter including ignition coil with improved isolation
FR2982711B1 (fr) * 2011-11-16 2014-01-10 Renault Sas Bougie d'allumage

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2467534A (en) * 1946-11-09 1949-04-19 American Bosch Corp Ignition unit
JP3864872B2 (ja) 2002-08-08 2007-01-10 株式会社デンソー 内燃機関用点火装置
FR2890248B1 (fr) 2005-08-25 2007-09-28 Renault Sas Bougie d'allumage a plasma pour un moteur a combustion interne

Also Published As

Publication number Publication date
WO2010043544A1 (fr) 2010-04-22
EP2351173A1 (fr) 2011-08-03

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